001 /* 002 /* 003 * Copyright 2005 John G. Wilson 004 * 005 * Licensed under the Apache License, Version 2.0 (the "License"); 006 * you may not use this file except in compliance with the License. 007 * You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 * 017 */ 018 package groovy.util.slurpersupport; 019 020 import java.util.Iterator; 021 import java.util.Map; 022 023 import org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation; 024 025 import groovy.lang.Closure; 026 027 /** 028 * Lazy evaluated representation of nodes filtered by attributes. 029 * 030 * @author John Wilson 031 */ 032 public class FilteredAttributes extends Attributes 033 { 034 private final Closure closure; 035 036 public FilteredAttributes(final GPathResult parent, final Closure closure, final Map namespaceTagHints) { 037 super(parent, parent.name, namespaceTagHints); 038 this.closure = closure; 039 } 040 041 public Iterator nodeIterator() { 042 return new NodeIterator(this.parent.iterator()) 043 { 044 protected Object getNextNode(final Iterator iter) { 045 while (iter.hasNext()) { 046 final Object node = iter.next(); 047 if (DefaultTypeTransformation.castToBoolean(FilteredAttributes.this.closure.call(new Object[]{node}))) { 048 return node; 049 } 050 } 051 return null; 052 } 053 }; 054 } 055 056 }